Belt-shifter.



No. 777,949. PATENTED DEC. 20, 1904.

G. GELNAY.

BELT SHIFTER.

APPLICATION FILED FEB. 26. 1904. N0 MODEL zsnnms-sz1nm 1.

UNITED STATES Patented. December 20, 1904.

PATENT OFFICE.

BELT-SHIFTER.

SPECIFICATION forming part of Letters Patent No. 777,949, dated December20, 1904.

Application filed February 26, 1904. Serial No. 195,3?7.

To ctZZ whom it may concern.-

Be it known that I, CHARLES GELNAY, acitizen of Austria-Hungary,residingat New York city, (Manhattan,) county and State of New York, haveinvented new and useful Improvements in Belt-Shifters, of which thefollowing is a specification.

This invention relates to a belt-shifter for varying the speedtransmitted from the conepulley of a motor .to the power-shaft.

The belt-shifter is particularly designed for regulating the speed ofthe pin-barrel in an autopneumatic musical instrument, but may also beapplied to other purposes.

In the accompanying drawings, Figure 1 is a front view of my improvedbelt-shifter; Fig. 2, a horizontal section on line? 7, Fig. 1; Fig. 3, aside view of the belt-shifter; Fig. 4, a vertical section on line 4: 4,Fig. 1, showing the parts in a different position; Fig. 5, a verticalsection on line 5 5,'Fig. 1; and Fig. 6 a crosssection on line 6 6, Fig.5.

The letter 6 represents a power-shaft the speed of which is to beregulated and which is journaled in bearings 0'. Upon shaft e isslidably mounted a pulley f, having a grooved hub f which engages afeather e of shaft 6. The pulley f receives motion by belt f from aconiform driving-pulleyc of electromotor c. The pulley f is adapted tobe shifted along shaft 6 to correspondingly shift belt f alongcone-pulley o, and thus vary the speed transmitted from the motor toshaft 0. To this eifect the pulley f is flanked by a pair of uprightarms connected by tubular sleeves g, the whole constituting a slidableframe G. The upper ends of arms g are formed, as at to straddle shaft 6and are provided with pins that bear against the hub f of pulley f. Theframe Gr, besides thus embracing the lower half of pulley f, alsoembraces the lower run of belt f, so that a lateral movement of theframe shifts the belt as well as the pulley. The frame G is slidablysupported upon a pair of transverse guide-rods h, passing throughsleeves g and secured to a pair of standards a of a frame a. In order toshift frame Gr, it is pivotally connected at t" to one end of ashipping-lever'z', fulcrumed to a post 11 and having slot Z forreception of pivot a, Fig. 2.

The other'end of lever 71 is turned up to form a lug Z, slotted for thereception of a pin j. This pin projects from the lower end of atransmission-lever j, turning on post j This lever is guided in aslotted bearing and is influenced by a spring j which serves to hold thelever under tension. The upper end of lever j is provided with a slotopposite a nut 76', mounted on a worm is. From the nut 70 projects a pinZ0 which enters the slot and thus serves to transmit the motion of thenut to the lever j. The worm It is by bevelwheels 70 Z intergeared witha shaft Z, turning in bearings Z of frame a and carrying hand-wheel Z 1fthe hand-wheel is turned in one direction, it will by bevel-wheels Z If,worm Z1, nut is, levers j 2', and frame G move the pulley f and belt fto the right, so as to cause the latter to engage the reduced end ofcone-pulley 0'. In this way the motion imparted by the electromotor tothe shaft 6 will be reduced. If the hand-wheel is turned in the oppositedirection, the belt f is in like manner shifted to the left to engagethe enlarged end of cone-pulley 0, and thus increase the speed impartedto shaft 6.

What I claim is I 1. In a belt-shifter, the combination of a power-shaftwith a pulley slidable thereon, a slidable frame embracing the pulley, aconiform driving-pulley, and a belt partly embraced by the slidableframe and connecting the pulleys, substantially as specified.

2. In a belt-shifter, the combination of a power-shaft having a feather,with a pulley slidable thereon and having a grooved hub, a forkedslidable frame embracing the pulley, a coniform driving-pulley, and abelt partly embraced by the slidable frame and connecting the pulleys,substantially as specified.

3. In a belt-shifter, the combination of a power-shaft with a pulleyslidable thereon, a slidable frame embracing the pulley, ashipping-lever engaging the frame, a transmission-lever pivoted to theshipping-lever, a nut engaging the transmission-lever, a worm engagingthe nut, and means for rotating the worm, substantially as specified.

4:. In a belt-shifter, the combination of a power-shaft with a pulleyslidable thereon, a

sliclable frame having tubular sleeves and tan,) New York, this 25th dayof February, adapted to embrace the pulley, guide-rods en- 1904. gagingthe sleeves, a coniform (:h'iving-pul- 1 y y ley, and a belt partlyembraced by the slicl- (JHARLES (TELNAY' 5 able frame and connecting thepulleys, subl/Vitnesses:

stantially as specified. FRANK V. BRIESEN,

Signed by me at New York city, (Manhat- FRED. UNFRIOHT.

